Percussion-fuse



S. KRUK.

' PERCUSSION FUSE.

APPLICATION FILED MN. 2-0. 1919.

Patented Mar. 30,1920.

STANLEY KRUK, F GLYMER, PENNSYLVANIA, ASSIGNOR 'IO KRUK PERCUSSION FUSECOMPANY, OF LATROBE, PENNSYLVANIA Specification of Letters Patent.

Patented Mar. 30, 1920.

Application filed January 20, 1919. Serial No. 272,087.

,Clymer, in thecounty of Indiana and State .of Pennsylvania, haveinvented certain new and useful Improvements in Percussion- Fuses; and Ido declare the following to be.

a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same:

This invention relates to percussion fuses, and relates moreparticularly to certain improvements on the device covered by my PatentNo. 1,232,814, issued July 10,1917.

One object of this invention is to greatly simplify the construction andminimize the cost of manufacture of articles of this character.

Another object is to greatly increase the efliciency or certainty ofexplosion upon being operated.

Another object is to materially increase the degree of safety and easeof operation.

Other objects and advantages may become apparent to persons whoread thefollowing details of description in connection with the accompanyingdrawings in which:

Figure 1 is an elevational View. illustrating my improved percussionfuse connected to a rope or cord whereby it is operated.

Fig. 2 is an enlarged longitudinal sectional view of my improvedpercussion fuse.

Fig.8 is a transverse sectional view along the line 33 of Fig. 2.

Fig. 4 is a transverse sectional view along the line 44 of Fig. 2.

Referring to these drawings in detail, in which similar referencecharacters correspond with similar parts throughout the several views,the device comprises a tubular body 5 which is preferably graduallytapered toward one end and provided with an annular or radial flange 6at its other end. A cap 7 having a peripheralinwardly ex 1 tendingflange 8 engages with the flange 6- so as to securely unite the cap withthe tubular body, and this cap is preferably concavo-convexed so that aspace is providedbetween the inner parts of the cap 7 and flange 6. Thisprovides oppositely disposed seats 9 on which a holding element 10normall rests. This holdingelement 10-pr'ef- 'erab y comprises an endportion of a length of wire which extends through an opening 11 in the'cap land may be attached to a rope or heavy cord as indicated at 12 inig. 1 for a purpose hereinafter explained.

A plunger or striker 13 is apertured at 14 to receive the wire holdingelement- 10, the

latter being engaged with the plunger 13 at a point between the seats 9,and this engagement of the plunger with the holding element 10 alsoprovides a seat for the upper end of aspring 15. The lower end portionof the plunger 13 is provided with oppositely extending studs 16 whichpro- 'vide a seat for the lower end of the spring 15, and these studs orthis spring seat-16 extends approximately to two opposite sides of thetubular body 5 so as to co-act with the said opposite sides in guidingthe plunger in its path of movement centrally of the tubular body 5. Thetop of the cap 7 is provided'with. a central recess 17 in which theupper end of the plunger 13 rests and is held in the central positionwith relation to the tubular body 5.

Within the lower or constricted end of the tubular body 5 is secured amass 18 of combustible or explosive material such as blasting gycerin ordynamite, and upon the top or inner surface of this combustible orexplosive mass is secured a cap 18 of fulminatingmaterial which may becomposed of nitroglycerin or other high explosive. An anvil or metal rod19. has it major portion embedded in the explosive mass 18, a small endportion of the rod 19 extending into the 99.

fulminating cap and being united with the latter so as to more securelyunite the ful-.

minating cap with the explosive mass 18.

In constructing a device of this kind, the

' rod or anvil 19 may be united with the fulminating material, prior tothe assembling of the device, by touching one end of the anvil against amass of fulminatin material so that a portion of the mass a ores-to theanvil, and the elements 18' and 19 become a unit so that excessiveconvenience and accuracy are assured in assembling the" device. Theanvil or red 19 is disposed at the end of the .path' of movement of thestriker 13, so that the latter will strike the 'fulminating cap adjacentto and directly over the end of. the anvil 19, thereb increasing theefliciency or certainty of t e explosion of the fulminating cap.

' In using this 'improved.percussion fuse,-

the same is embedded in a charge of powder, dynamite or other blastingmaterial, the wire 10 extending out through the latter, and after thecharge of blasting mate: rial is tamped in the usual manner, the rope ispulled with sufficient force to draw t e wire 10 through the aperture oropening 11 and out-of engagement with the striker 13; whereupon, thespring 15 expands until it is stopped by the cap 7, and the plunger orstriker 13 is then impelled by the spring and guided by the lateralprojections 16 to strike the fulminating cap directly over the upper endof the anvil 19. This causes the fulminating cap to explode, and itsexplosion causes the explosive mass 18 to explode and transmit itsexplosive force and heat to the charge of blasting material.

Because of the holding elementof the wire 10 being supported at twopoints, and the plunger 13 being supported thereby between these twopoints, the wire 10 may be relatively light and flexible as comparedwith that of my prior patent in which the plunger-holdin member issupported at one point only. fibviously, this relation of parts not onlyabsolutely prevents the plunger from being accidentally released fromits holder, but it also renders the'device more easily operated becauseof the wire 10 bein more flexible.

Although i have described this embodiment of my invention veryspecifically, it is not intended to limit this invention to these exactdetails of construction and arrangement of parts, but I am entitled tomake changes within the scope of the inventive ideas disclosed in theforegoing description and following claims.

What I claim as my invention is:

1. A percussion fuse comprising a tubular body, explosive material insaid tubular body, a spring-pressed plunger in said tubular body andoperatable to strike said explosive material, and a length of wirenormally supported by opposite sides of said body and engaged with saidplunger belar body, anexplosive mass therein, a fulminating cap on saidexplosive mass, an anvil embedded at least partly in said explosive massand united with said fulminating cap so as to constitute both an anviland a secure anchorage for the fulminating material, and a striker inthe tubular body and operatable to strike the fulminating cap at a pointalined with said rod.

3. A percussion fuse comprisin a tubular body, an explosive masstherein, a fulminating cap on said explosive mass, an anvil embedded atleast partly in said explosive mass and extending .into and umted withsaid fulminating cap, and thus securing the latter in position on theexplosive body, and a striker in the tubular body and operatable tostrike the fulminating cap at a point adjacent to the said anvil.

4. A percussion fuse comprising a tubular body having a radial flangearound one end, a cap engaged with said flan e and closing said end of,the tubular body and being spaced from the tubular body to provide seatson opposite sides of said tubular body, a springpressed plunger in saidtubular body, a holding member normally on said seats and engaging withsaid plunger between said seats and thus securely holding said plungeragainst the force of the plunger-spring, and explosive material insition within said tubular body to be struc by said plunger, saidholding member being movable for releasing said plunger and permittingits actuation by said plunger-spring.

In testimony whereof I have hereunto set 111 hand.

y I STANLEY KRUK.

